Axetris AG
LGD F200P2 Operating Instructions - Rev D
19.09.2018
25/60
The 0 - 5V analog ouput is slightly limited due to the hardware. In reality, the 0V is around
0.1V and the 5V round 4.9V. To ensure good performance in the upper and lower range, an
additional analog output calibration is recommended.
2.12.5.3 Adjusting firmware integration time (T90)
The sensor always sends one value per second. The integration time can be increased for applications
where longer measurement periods can be accepted. This reduces the noise of the measurement but
increases the reaction time when changing the gas concentration. If the integration time is increased, the
one-second measurement values sent by the sensor represent a moving average. The type of averaging
used is an exponential weighted average (1-pole
IIR filter
similar to an RC filter, for further information
check LGD FAQ document).
It is characterized by the time necessary to reach 90 percent of the final
value (T90). The character of this type of integration is very similar to a standard moving average, but is
more economic in terms of memory take-up. The value set in the user interface will be saved in the
firmware of the sensor and thus is available even after disconnecting the sensor from the PC and when
the analog output is used.
Min value:
0 s (no Integration)
Max value:
600 s (limited to this value)
The integration on the concentration values is directly linked with the analog output. The
measured concentration is directly transferred into an analog value.
If you have a two gas system like NH
3
or HCl, the integration is also done on the
water concentration.
2.12.5.4 Diagnostic mode switch
In normal mode (RS 232 interface), the sensors send the measurement data, including Gas
concentrations, error status, and in case of heated system, the temperature of the cell. When switching to
diagnostic mode, an additional data package can be received allowing for advanced sensor monitoring.
Diagnostic Mode = 0 (inactive)
Normal mode / Diagnostic Mode = 1 (active)
Diagnostic mode
(please also refer to TN_LGD_How to get Diagnostic Data)
2.12.5.5 Laboratory mode switch
To adapt the LGD F200P2 sensor to specific application conditions, the sensor can be
configured accordingly.
Laboratory Mode = 0 (inactive)
Normal mode / Laboratory Mode = 1 (active)
Laboratory mode
(please also refer to TN_LGD_Operation Modes SCR CEM)
2.12.5.6 Analog_switch
For two gas sensors (typically for NH
3
, HCl in
combination with H
2
O and other two gas
applications) the analog output (4…20 mA or
0…5 V) can be linked to other values than the
target gas reading. It offers the possibility of
assigning the Gas1 or Gas2 concentration to the
analog output.
Optionally, the compensated Gas1 (Gas1_Comp)
also can be configured to the output shown in
Figure 21.
Figure 21
Analog_switch configuration and
assigment
Содержание LGD F200P2
Страница 1: ...Operating Integration Instructions Laser Gas Detection OEM Module LGD F200P2 Axetris AG...
Страница 57: ...Axetris AG LGD F200P2 Operating Instructions Rev D 19 09 2018 57 60 Notes...
Страница 58: ...Axetris AG LGD F200P2 Operating Instructions Rev D 19 09 2018 58 60 Notes...
Страница 59: ...Axetris AG LGD F200P2 Operating Instructions Rev D 19 09 2018 59 60 Notes...
Страница 60: ...Axetris AG LGD F200P2 Operating Instructions Rev D 19 09 2018 60 60 Notes...
